参数资料
型号: LT1374CFE#TRPBF
厂商: Linear Technology
文件页数: 1/32页
文件大小: 0K
描述: IC REG BUCK ADJ 4.5A 16TSSOP
标准包装: 2,500
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 2.42 V ~ 21.5 V
输入电压: 5 V ~ 25 V
PWM 型: 电流模式
频率 - 开关: 500kHz
电流 - 输出: 4.5A
同步整流器:
工作温度: 0°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 16-TSSOP(0.173",4.40mm)裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 16-TSSOP-EP
LT1374
4.5A, 500kHz Step-Down
Switching Regulator
FEATURES
DESCRIPTIO
Constant 500kHz Switching Frequency
High Power 16-Pin TSSOP Package Available
Uses All Surface Mount Components
Inductor Size Reduced to 1.8 μ H
Saturating Switch Design: 0.07 ?
Effective Supply Current: 2.5mA
Shutdown Current: 20 μ A
Cycle-by-Cycle Current Limiting
Easily Synchronizable
The LT ? 1374 is a 500kHz monolithic buck mode switching
regulator. A 4.5A switch is included on the die along with
all the necessary oscillator, control and logic circuitry. High
switching frequency allows a considerable reduction in the
size of external components. The topology is current mode
for fast transient response and good loop stability. Both
fixed output voltage and adjustable parts are available.
A special high speed bipolar process and new design tech-
niques achieve high efficiency at high switching frequency.
Efficiency is maintained over a wide output current range
APPLICATIO S
by using the output to bias the circuitry and by utilizing a
supply boost capacitor to saturate the power switch.
Portable Computers
Battery-Powered Systems
Battery Chargers
Distributed Power
The LT1374 is available in standard 7-pin DD, TO-220, fused
lead SO-8 and 16-pin exposed pad TSSOP packages. Full
cycle-by-cycle short-circuit protection and thermal shut-
down are provided. Standard surface mount external parts
may be used, including the inductor and capacitors. There
is the optional function of shutdown or synchronization. A
shutdown signal reduces supply current to 20 μ A. Synchro-
nization allows an external logic level signal to increase the
internal oscillator from 580kHz to 1MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents, Including 6111439, 5668493, 5656965
TYPICAL APPLICATIO
5V Buck Converter
Efficiency vs Load Current
C2
D2
CMDSH3 OR FMMD914
100
95
V OUT = 5V
V IN = 10V
L = 10 μ H
INPUT
6V TO 25V
C3*
10 μ F TO
50 μ F
+
DEFAULT
= ON
V IN V SW
SHDN SENSE
0.27 μ F
BOOST
LT1374-5 BIAS
GND V C
C C
1.5nF
L1**
5 μ H
D1
MBRS330T3
+
OUTPUT**
5V, 4.25A
C1
100 μ F, 10V
SOLID
TANTALUM
90
85
80
75
* RIPPLE CURRENT RATING ≥ I OUT /2
** INCREASE L1 TO 10 μ H FOR LOAD CURRENTS ABOVE 3.5A AND TO 20 μ H ABOVE 4A
1374 TA01
70
0
0.5
1.0
1.5
2.0 2.5 3.0
3.5
4.0
SEE APPLICATIONS INFORMATION
LOAD CURRENT (A)
1374 TA02
1374fd
1
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